Ensure that all scripts are executed prior to astro:page-load

[martrapp]

Changes

Fixes #12858

The original code to execute scripts after swap() made the assumption that all inline scripts
are directly executed when inserted into the DOM. This is not true for inline module scripts,
which are deferred but still executed in order.
Inline module scripts can not be awaited for with onload.
Thus to be able to wait for the execution of all scripts,
we make sure that the last inline module script
is always followed by an external module script.

Testing

new e2e test

Docs

n.a. / bugfix

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Latest commit: e3067e4

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[codspeed-hq]

CodSpeed Performance Report

Merging #13380 will not alter performance

_{Comparing mt/page-load (e3067e4) with main (725bc0d)}

Summary

✅ 6 untouched benchmarks

[ematipico]

I am not very familiar with the code, but if the test passes, it should be good to merge!